JPH07129942A - Magnetic head drive device and assembling method thereof - Google Patents

Abstract

(57) [Abstract] [Purpose] A method of easily and accurately assembling a drive element fixing portion and a magnetic head mounting portion of a magnetic head driving device including a piezoelectric element. [Structure] In the magnetic head drive device of FIG. 1, reference numerals 1 and 2 denote piezoelectric elements, one end of which is fixed to a drive element fixing member 3 and the other end of which is adhesively fixed to a link member 7. 8 is a magnetic head, which is adhered and fixed to the head base 9 and mounting screw 10
The head base 9 is fixed to the link member 7. Here, the parallelism between the mounting reference surface 3a of the drive element fixing member and the mounting portion 7a of the link member 7 is maintained by maintaining the gaps d1 and d2 that absorb the cumulative accuracy of the components that causes tilting in the magnetic head 8. The piezoelectric elements 1 and 2 and the link member 7 can be bonded to each other while maintaining high accuracy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head driving device used for auto-tracking of a magnetic recording / reproducing device such as a video tape recorder, and an assembling method thereof.

[0002]

2. Description of the Related Art In recent years, a magnetic recording / reproducing apparatus such as a VTR has been digitized in order to achieve high image quality, high sound quality and dubbing performance. It is configured to support high density recording such as heads. In addition, in a broadcast VTR, a plurality of reproducing heads are mounted on a magnetic head driving device using a piezoelectric element with a high relative accuracy in order to support a variable speed search function such as slow motion. ing.

A conventional magnetic head drive device assembling method will be described below with reference to the drawings.

3 and 4 are a side view and a plan view of a conventional magnetic head driving device. In FIG. 3, 21, 22
Is a pair of piezoelectric elements, one end of each of which is sandwiched between a driving element fixing member 23 and a pair of spacers 24 and 25 and is screwed by a fixing screw 26. On the other hand, the piezoelectric element 2
Twenty-seven link members are adhesively fixed to the other ends of the first and the second members. To the link member 27, 29 head bases to which 28 magnetic heads are adhered and fixed are detachably attached by 30 attachment screws. The magnetic head driving device is fixed on a rotary drum (not shown) by the mounting reference surface 23a of the driving element fixing member 23.

Further, the structure of the magnetic head 28 will be described with reference to FIG. In FIG. 4, a link member 27 is adhesively fixed to the tip of the piezoelectric element 21 (22 has the same shape), and a head base 29 to which four magnetic heads 28 are adhesively fixed is attached to the tip thereof in a separable manner. . The magnetic heads 28 are arranged on the circumference such that the head protrusion amounts from the rotation centers of the 31 rotating drums are equal.

[0006]

However, in the above-described conventional magnetic head drive device, the piezoelectric elements 21 and 22 and the link member 27 are simply brought into close contact with each other as shown in FIG. It was a construction method in which the error of was accumulated. That is, as shown in FIG.
Has a tilt with respect to the longitudinal direction, the magnetic head 28 attached to the tip thereof has a tilt (angle of tilt in the vertical direction) of the angle θ.

Here, as shown in FIG. 4, four magnetic heads 28 are provided.
Are arranged on the circumference so that the head protrusion amounts from the center of rotation are equal, the four magnetic heads 28 are arranged due to the difference A in distance between the central magnetic head and the end magnetic heads. A difference in relative height will occur between the two on both ends and the two in the center.

When the magnetic head 28 is tilted upward as in the case of FIG. 3, the center two are relatively higher than the two ends. Therefore, the higher the accuracy of the head relative height is required, the more severe the tilt of the magnetic head 28 is. Conventionally, the accuracy of the related parts having a factor that causes tilt is controlled to extremely strict accuracy, or the attachment surface 27a of the head base 29 of the link member 27 is completed at the stage when the adhesive fixing of the link member 27 is completed.
There is a problem in that it is necessary to maintain the accuracy by assembling with a milling machine or the like.

The present invention solves the above problems, and eliminates tilting without the need for high-precision parts and assembly processing that is time-consuming in production, and a magnetic head drive device that does not cause a relative height difference. It is an object to provide an assembling method thereof.

[0010]

To achieve the above object, the present invention provides a pair of piezoelectric elements for displacing a magnetic head, a drive element fixing member for fixing one end of the piezoelectric element, and one end of the piezoelectric element. Of the link member, and a head base fixed to the other end of the link member and having the magnetic head attached thereto.

Also, a positioning step of positioning the piezoelectric element and the link member with a gap while keeping the attachment surface of the link member parallel to the reference plane of the driving element fixing member, and filling the gap with a filling member. And a filling step of performing the filling step.

Further, a positioning step of positioning the link member so that at least one of the piezoelectric elements and the link member are lightly abutted while keeping the mounting surface of the link member parallel to the reference surface of the driving element fixing member, and each of the piezoelectric elements. And a joining step of joining the element and the link member by filling or bonding.

[0013]

In the assembling of the magnetic head driving device having the above structure,
By joining the piezoelectric element and the link member with a gap, it is possible to absorb the variation in accuracy of related components in the gap, and as a result, prevent the magnetic head from tilting,
Further, it is possible to suppress the height variation of the magnetic head.

Further, by positioning at least one of the piezoelectric elements and the link member so that they are brought into abutting contact with each other, and then joining them, variations in accuracy of related parts are absorbed, tilting of the magnetic head is eliminated, and further, relative movement of the magnetic head. The height difference can be eliminated.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 are side views showing a magnetic head driving device and an assembling method thereof according to an embodiment of the present invention.

In FIG. 1, reference numerals 1 and 2 denote a pair of piezoelectric elements, one end of each of which is sandwiched between a drive element fixing member of 3 and a pair of spacers of 4 and 5 and screwed by a fixing screw of 6. . On the other hand, 7 link members are adhesively fixed to the other ends of the piezoelectric elements 1 and 2. Attachment surface 7 of link member 7
A head base 9 on which 8 magnetic heads are mounted is detachably screwed to a by a mounting screw 10. Although not shown, the plan view of the magnetic head driving device in this embodiment is the same as that of the conventional example shown in FIG. 4, and therefore the arrangement of the magnetic heads 8 is also the same.

Further, the driving element fixing member 3 will be described with reference to FIG.
The relationship between and the link member 7 will be described. An attachment jig 11 indicated by hatched portions has two surfaces that are parallel to each other, and these surfaces are attached to the attachment reference surface 3 a of the drive element fixing member 3 and the link member 7.
By making contact with the mounting surface 7a of the piezoelectric element 1, 2 and the link member 7 while maintaining parallelism between the mounting reference surface 3a of the driving element fixing member 3 and the mounting surface 7a of the link member 7.
Align so that gaps d1 and d2 are provided between
Adhesive fixing is performed so that the gap is filled with an adhesive. still,
Although not shown, the link member 7 and the drive element fixing member 3 are fixed to the mounting jig 11 while maintaining their flat surfaces by a known method such as screwing.

As described above, according to the magnetic head drive device assembling method of the present embodiment, it is not necessary to carry out highly accurate parts or assembling work which is time-consuming in production, and variations in accuracy of the related parts are not required at the time of assembling. It can be absorbed in the gap between the piezoelectric element and the link member to suppress the tilt of the magnetic head, and as a result,
The relative height difference of the magnetic head can be eliminated.

Further, by using the mounting jig shown in FIG. 2, the absolute height of the mounting surface 7a with respect to the mounting reference surface 3a is also regulated, and as a result, the absolute height variation of the magnetic head can be suppressed.

In this embodiment, the gaps between the respective piezoelectric elements are provided at two locations d1 and d2. However, the two locations are not necessarily the same due to variations in parts, so that the gap is only on one side. Needless to say, the same effects and advantages of the present invention can be obtained.

Next, another embodiment of the present invention will be described. In another embodiment of the present invention, a mounting jig corresponding to the mounting jig 11 shown in FIG. 2 has an adjustable distance between two surfaces parallel to each other. And the link member 7
When the alignment is performed, the link member 7 is brought close to either one of the piezoelectric elements 1 or 2 until it is lightly contacted. The distance between the bonded portions of the link member 7 to the piezoelectric element is designed to be the same as the distance between the piezoelectric elements 1 and 2. However, in reality, there is a slight error. Or, when one of the two is lightly touched, the other usually has a slight gap.

Next, in this state, the link member 7 and the piezoelectric elements 1 and 2 are bonded with an adhesive, and if there is a gap, the gap is filled.

According to the assembling method of the present embodiment, although the absolute height variation of the magnetic head remains, since the tilt can be absorbed,
The relative height difference can be eliminated.

Further, since the assembling method of this embodiment requires less adhesive to be filled than the above-mentioned embodiments, there is an advantage that even if the adhesive is deformed due to curing, its influence is reduced. is there.

[0026]

As is apparent from the above description, according to the magnetic head driving apparatus and the assembling method thereof of the present invention, the piezoelectric element and the link member are fixed to each other with a gap therebetween so that the magnetic head can be tilted. It is possible to obtain the effect of being able to prevent it and further suppressing the height variation of the magnetic head.

Further, by arranging at least one of the piezoelectric elements and the link member so that they lightly contact each other and then joining them, the tilt of the magnetic head can be eliminated, and the difference in relative height of the magnetic head can be eliminated. Is obtained.

[Brief description of drawings]

FIG. 1 is a side view showing a magnetic head driving device according to an embodiment of the present invention.

FIG. 2 is a side view showing an assembling method of the magnetic head driving device in the embodiment of the present invention.

FIG. 3 is a side view showing an assembling method of a conventional magnetic head driving device.

FIG. 4 is a plan view of a conventional magnetic head drive device.

[Explanation of symbols]

 1, 2 Piezoelectric element 3 Drive element fixing member 3a Mounting reference surface 4, 5 Spacer 6 Fixing screw 7 Link member 7a Mounting surface 8 Magnetic head 9 Head base 10 Mounting screw 11 Mounting jig

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Goto 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (5)

[Claims] 1. A pair of piezoelectric elements for displacing a magnetic head, a drive element fixing member for fixing one end of the piezoelectric element, a link member having one end joined to the other end of the piezoelectric element, and the link member. A magnetic head driving device comprising a head base fixed to the other end and having the magnetic head attached, wherein a gap is provided between the piezoelectric element and the link member, and a filling member is filled in the gap. A magnetic head driving device characterized by being joined. 2. A pair of piezoelectric elements for displacing a magnetic head, a driving element fixing member for fixing one end of the piezoelectric element and having a reference surface, and a mounting surface provided at one end and the other end of the piezoelectric element at the other end. A method of assembling a magnetic head drive device, comprising: a link member joined to a link member; and a head base fixed to a mounting surface of the link member and having the magnetic head mounted thereon, wherein the mounting surface of the link member is A positioning step of positioning the link member by providing a gap between the piezoelectric element and the link member while keeping the driving element fixing member parallel to the reference plane, and a filling step of filling the gap with a filling member And a head base fixing step of fixing the head base to the link member. 3. The positioning step uses a mounting jig having two surfaces parallel to each other, one surface of the mounting jig is brought into contact with a reference surface of a drive element fixing member, and the other surface is linked. The method of assembling a magnetic head drive device according to claim 2, wherein the magnetic head drive device is positioned by abutting against a mounting surface of the member. 4. A pair of piezoelectric elements for displacing a magnetic head, a drive element fixing member that fixes one end of the piezoelectric element and has a reference surface, and a mounting surface provided at one end and the other end of the piezoelectric element at the other end. A method for assembling a magnetic head drive device, comprising: a link member joined to a link member; and a head base joined to an attachment surface of the link member and having the magnetic head attached thereto, wherein the attachment surface of the link member is A positioning step of positioning so that at least one of the piezoelectric elements and the link member lightly abut while maintaining parallel to the reference plane of the driving element fixing member, and filling between each piezoelectric element and the link member. Alternatively, there is provided a magnetic head drive characterized by having a joining step of joining by adhesion and a head base fixing step of fixing the head base to the link member. Device assembly method. 5. The positioning step uses a mounting jig having two surfaces which are parallel to each other and whose distance can be adjusted, and one surface of the mounting jig is brought into contact with a reference surface of a drive element fixing member, 5. The magnetic head drive device assembling method according to claim 4, wherein the other surface is brought into contact with the mounting surface of the link member for positioning.